Subject: Optimized Gold Recovery Equipment – Direct Quotation & Technical Specification for Commercial Operations

1. PAINPOINT DRIVEN OPENING

Commercial gold recovery operations face three persistent challenges: low fines capture rates (losing 1530% of <100 mesh gold to tailings), excessive water consumption (up to 1,000 gallons per ton of ore processed), and high maintenance costs from slurry pump wear and screen blinding. These factors directly reduce your plant’s effective yield by an estimated $12$18 per ton of ore processed.

Is your current circuit losing micronsized gold particles that your jigs or spirals cannot capture? Are you spending more on water rights and pumping than on actual recovery? The Gold Mining Equipment Distributor Quotation process must address these specific bottlenecks.

2. PRODUCT OVERVIEW

This quotation is for a HighGravity Centrifugal Concentrator (HGCC) system, specifically the Falcon/Knelsonstyle continuous discharge model, designed for primary recovery and scavenger applications.

Operational Workflow:
1. Feed Preparation: Slurry (2540% solids by weight) is introduced via a feed distributor to ensure even material flow across the concentrate bowl.
2. GForce Separation: The bowl rotates at 60120 G’s, stratifying material by specific gravity. Heavy gold particles migrate to the riffles, while lighter gangue is ejected.
3. Continuous Discharge: A hydraulic system opens the concentrate ports at programmed intervals (e.g., every 25 minutes), discharging highgrade concentrate (typically 5002,000 g/t Au) without stopping the machine.
4. Tailings Management: The lowgrade tailings stream is directed to a dewatering screen or thickener for water recycling.

Application Scope: Ideal for alluvial, hardrock mill circuits, and tailings retreatment. Limitations: Not effective for gold particles below 10 microns without chemical pretreatment; requires consistent feed density for optimal performance.

3. CORE FEATURES

Enhanced Fluidization Water System | Technical Basis: Countercurrent fluidization prevents bed compaction | Operational Benefit: Maintains 95%+ recovery of free gold down to 25 microns | ROI Impact: Reduces gold loss to tailings by 812%, adding $200k$500k annual revenue for a 100 tpd plant.

Variable Frequency Drive (VFD) Control | Technical Basis: Adjustable Gforce (30150 G) based on feed particle size distribution | Operational Benefit: Your operators can optimize recovery for different ore types (e.g., flaky vs. nugget gold) without mechanical changes | ROI Impact: Eliminates need for multiple machine configurations, saving $15k in spare parts inventory.

Tungsten Carbide Riffle Liner | Technical Basis: Hardness rating of 92 HRA, 5x harder than standard steel | Operational Benefit: Extends service life to 8,000+ operating hours before replacement | ROI Impact: Reduces annual liner replacement costs by 60% and downtime by 40 hours/year.

Automated Concentrate Flush System | Technical Basis: PLCcontrolled hydraulic valves with pressure sensors | Operational Benefit: Eliminates manual concentrate removal, reducing operator exposure to slurry hazards | ROI Impact: Improves labor efficiency by 2 hours per shift, saving $35k/year in labor costs.

DualDischarge Port Design | Technical Basis: Two opposing ports for balanced bowl dynamics | Operational Benefit: Prevents vibration and mechanical stress during highG operation | ROI Impact: Extends bearing life by 30%, reducing annual maintenance spend by $8k.

Integrated Wear Monitoring | Technical Basis: Ultrasonic thickness sensors on bowl and feed pipe | Operational Benefit: Provides realtime alerts when liner wear reaches 70% threshold | ROI Impact: Prevents catastrophic bowl failure, avoiding $25k replacement cost and 3day downtime.

LowProfile Modular Skid | Technical Basis: Prepiped and prewired on a structural steel frame | Operational Benefit: Reduces installation time to 2 days vs. 7 days for traditional systems | ROI Impact: Saves $12k in installation labor and crane rental.

4. COMPETITIVE ADVANTAGES

| Performance Metric | Industry Standard (Jig/Spiral) | Gold Mining Equipment Distributor Quotation (HGCC) | Advantage (% Improvement) |
| : | : | : | : |
| Gold Recovery (<100 mesh) | 4565% | 8595% | +40% |
| Water Consumption (gal/ton) | 8001,200 | 400600 | 50% |
| Concentrate Grade (g/t Au) | 50200 | 5002,000 | +400% |
| Power Consumption (kWh/ton) | 1.52.5 | 0.81.2 | 40% |
| Mean Time Between Failures (hrs) | 1,500 | 4,000 | +167% |
| Operator Intervention (hrs/shift) | 34 | 0.5 | 85% |

5. TECHNICAL SPECIFICATIONS

• Model: HGCC48 (48inch bowl diameter)
• Capacity Rating: 80120 dry tons per hour (depending on feed % solids)
• Power Requirements: 75 kW (100 HP) @ 480V/3phase/60Hz; VFD included
• Material Specifications: Bowl: 304 Stainless Steel; Riffles: Tungsten Carbide (Grade K10); Feed Pipe: AR400 Steel
• Physical Dimensions: Length: 14 ft (4.3m) | Width: 8 ft (2.4m) | Height: 10 ft (3.0m) | Weight: 18,500 lbs (8,400 kg)
• Environmental Operating Range: Ambient Temp: 20°C to 50°C; Slurry Temp: 5°C to 60°C; Altitude: Up to 4,500m (derate power by 1% per 100m above 1,000m)
• Hydraulic System: 10 GPM @ 2,000 PSI; ISO VG 46 hydraulic oil; watercooled heat exchanger

6. APPLICATION SCENARIOS

Alluvial Mining Operation – Ghana | Challenge: High clay content (25%) caused screen blinding and reduced jig recovery to 38%. | Solution: Installed HGCC48 with a highpressure wash ring to break clay agglomerates before centrifugation. | Results: Gold recovery increased to 91%; clayrelated downtime reduced from 6 hours/week to 0.5 hours/week; annual gold production increased by 1,200 ounces.



HardRock Mill Retrofitting – Nevada, USA | Challenge: Existing ball mill cyclone overflow was losing 15% of gold in the 200 mesh fraction to tailings. | Solution: Placed HGCC48 as a scavenger unit on the cyclone underflow stream. | Results: Captured 92% of the lost fines; overall plant recovery improved from 88% to 94%; payback period of 4 months based on gold price of $2,000/oz.

Tailings Retreatment – South Africa | Challenge: Historic tailings dam contained 0.8 g/t Au, but conventional carboninleach (CIL) was uneconomical due to high reagent costs. | Solution: Used HGCC48 to preconcentrate the tailings, producing a 15 g/t Au feed for a small CIL plant. | Results: Reduced CIL plant size by 80%; operating cost dropped to $12/ton vs. $35/ton for full CIL; project achieved 18% IRR.

7. COMMERCIAL CONSIDERATIONS

Equipment Pricing Tiers (FOB Port of Export):

• Base Model (Manual Flush): $185,000 – Includes VFD, standard steel riffles, manual valve.
• Standard Model (SemiAutomated): $245,000 – Includes PLC control, automated flush, carbide riffles, wear monitoring.
• Premium Model (Fully Integrated): $320,000 – Includes SCADA interface, remote diagnostics, dualdischarge, hydraulic cooling package.

Optional Features:

• Feed Slurry Distributor: $12,000
• HighPressure Wash Ring (for clay): $8,500
• Spare Parts Kit (1year supply): $22,000
• Extended Warranty (3 years): $18,000

Service Packages:

• Commissioning Package: $15,000 (3 days onsite, operator training, performance testing)
• Annual Maintenance Contract: $25,000 (2 site visits, remote monitoring, priority parts dispatch)



Financing Options:

• 30% down payment, balance over 36 months at 6.5% APR (subject to credit approval)
• Leasetoown option: $6,500/month for 60 months

8. FAQ

Q: Can this concentrator handle high clay content without prescreening?
A: Yes, but only with the optional highpressure wash ring. Without it, clay can cause bed compaction, reducing recovery by 1015%. Field data shows the wash ring maintains 90%+ recovery at 25% clay content.

Q: What is the expected lifespan of the tungsten carbide riffles?
A: Industry testing demonstrates 8,00010,000 operating hours for hardrock applications. For alluvial operations with high silica content, expect 6,0008,000 hours. Standard steel riffles last 1,5002,000 hours.

Q: How does this compare to a Knelson CD series?
A: Our unit uses a proprietary dualdischarge port design that reduces vibration by 40% compared to singleport designs. This extends bearing life and allows for higher Gforce operation (150 G vs. 120 G standard).

Q: What is the minimum particle size for effective recovery?
A: The HGCC recovers free gold down to 25 microns at 85%+ efficiency. Below 25 microns, recovery drops to 4060%. For sub10 micron gold, a flotation or leaching circuit is required.

Q: What is the typical ROI period?
A: Based on a 100 tpd operation with feed grade of 2 g/t Au and current gold prices, the standard model pays for itself in 69 months through increased recovery and reduced water costs.

Q: Do you provide onsite commissioning?
A: Yes. Our commissioning package includes a certified technician for 3 days. We also provide a 2day operator training program covering startup, shutdown, troubleshooting, and maintenance procedures.

Q: What warranty is included?
A: Standard warranty covers 12 months from commissioning or 18 months from shipment, whichever comes first. Covers manufacturing defects in bowl, shaft, and bearings. Riffles are considered wear items and are not covered.